Travel in the city of over 600,000 is now virtually impossible. The Massachusetts Bay Transportation Authority has suspended activity. All schools and public buildings are closed. “All city employees were told to stay in place and not come to work. If they are already at work, they have been asked to stay in place,” NBC News reports this morning. All taxi service in the city of Boston has been suspended pending further notice, according to Fox 4 News.

In Watertown, Massachusetts, State Police confirm they are conducting a door-to-door, house-to-house search. “Police will be going door by door, street by street, in and around Watertown. Police will be clearly identified. It is a fluid situation,” Dailybhaskar reports.

According to CBS News, “Shelter in place” is usually used for chemical or biological attack.